Development of Head End Thickness Control Technology for Gripping
Ultra High-Tensile-Strength Steel Strip in Tandem Hot Strip Mill

Abstract

As automobile weight reduction is an urgent issue in reducing CO₂ from automotive emission, we produce an ultra high-tensile-strength steel strip in a tandem hot strip mill by high-reduction rolling. However in the implementation of high-reduction rolling for an ultra high-tensile-strength steel strip, one serious problem was slippage when the head end did not grip rolls in the finishing latter stand. We confirmed that the head end shape became a bump and the new head end thickness control technology was realized; that is the head end of the rolled slip is thinned down to a thickness less than the programmed thickness like a wedge in the previous stand and it maintains gripping capability in the next stand.